236 COMPOSITAE 
1. ee eee A. Gray. Yellow-head. Fig. 5386. 
Lgehyrctes incisa rte Gray, Mem, r. Acad..II. 5: 322. 1854. 
Gray in ig Bet Se yee 97. 1859. 
t herbs branched from the base, more or less densely floccose-villous iroughout 
0d ase 
except ae gots ncles, the stems 0.5-2 clustered toward the sl 
: i cres 6-7 mm. high, hemispheric; phyllaries lanceolate to oblanceolate, 
glandular as well as floccose-villous ; peduncles 8- . long, slender, h, so h 
a = 
lar; flowers 35-80, the corollas 4 mm. long, puberulen t and somewhat glandular ; achenes 3 m 
long, sharply truncate at apex, 5- ib the pappus- Sale as long as or longer than the abhetie 
hyaline, stramineous or slightly brownish. 
Gravelly soil, mesas and canyons, sis Sonoran Zone; southern a, eastern San Bernardino County, 
mcr fei southward through the —— ere to wental Lower Cilitoonis and a to western Arizona. 
locali ity: ‘On the Californian deser e Rio Colorado.”? Feb.-May; Oct.— 
50. CHAENACTIS DC. Prod. 5: 659. 1836. 
Annual, biennial, or perennial herbs sometimes suffrutescent as base. Leaves basal, 
persisting in some perennial forms, and alternate above, subentire to more or less pinnately 
: : si 
species. Flowers white, yellow, or pinkish, perfect, regular; tube very short; throat nar- 
rowly funnelform to almost tubular, the short spreading limb 5-cleft and usually densely 
margined, mostly conspicuous, sometimes vestigial, the pappus-paleae of the margina 
flowers markedly shorter than those of the disk. [From the Greek words meaning to gape 
and ray, in reference to the marginal flowers 
A genus of about 25 species, all <agpichons of —* North nee rica. Type species, Chaenactis glabriuscula DC. 
The pote Heer of many of the annual species of Chaenactis overlaps and there is evidence that tee taxa 
oo experimentally and also na Tatrecaentty in santre (see Stockwell, Contr. Dudley Herb. 3: 89-168. 
aceaiee or stout Sa Le 
Leaves not flattened, th d or crisped and often revolute-margin 
potion near in outline, the pinnae very short, crisped and of equal nat —— of southern 
alifornia. antolinotdes. 
Leaves not ncaa in outline, the pinnae not of equal length; plants tall and po or Servo alpines. 
8. a diatom and varieties. 
ay 
Leaves awa the divisions cial Sui or not at all revolute on the margins (except C. sa). 
Pla ining’ beau ng; 8 Ente ms — rt, leafless; plants of the Sierra Nevada Califarais. 
1 erulent . C. nevadensis. 
Phyllaries tochaakaen Tack ing glands. . C. alpigena. 
Pianta baugielentsaagy be ee or at least with a woody caudex; gain stems more or Jess leafy. 
ia ringly glandular with coarse hai 
= Wits lars. i626 mm. high; plants of the Stakisou e region, Soar 
ae — 
Heads smaller, 11-14 mm. high; plants of the Wenatchee wine , Washin ngton 
Phyllaries without coarse gg it hairs. 
Heads 2. 
—3 ne solita borne well above the basal leaves on stems with much-reduced leaves; 
plant ok: poatheris Caitornes mountai . C. parishii. 
Heads ‘mostly solitary, not muc ch surpassing the basal leaves, die stem-leaves not reduced in 
1 Washington 4. C, thompsonii 
Annuals or winter annuals. 
Phyllaries Or aes or obtuse at the apex, or if at all attenuate not with slender, terete, colored tips; receptacle 
nake 
Pages absent or rudimen' 
Slender, Salta oe a slants: acheries papillate; John Day Valley, Oregon. be 
10. C. nevit. 
Coarse, white-fi 1 pl h hat st : t thern California. 
& , 5 
11. C. artemisiaefolia. 
Pappus ch. sagt lor2s 
Stam _aioeokat schataae cornu 10-14 mm. long. ; 12. C. macrantha. 
Supeciee serted; corollas — mm long. 
ein sess usually 8 in 2 s 
Inner Soe outer series oe eadiae not markedly different in leneth: pis eaete. of southeastern 
egon cu. 
Inner and ater ries of — — different in length, the aioe eo reduced but 
equaling the i ost num 
Flower-heads white; teice cntiie or with 1 or 2 pairs of or pinnae. 
ntiana. 
